some models when // src and dst point to the same underlying array. We also need a // buffer for counter values. var ctrbuf, srcbuf [2048]byte for len(src) >= 16 { siz := len(src) if len(src) > len(ctrbuf) { siz = len(ctrbuf) } siz &^= 0xf // align siz to 16-bytes copy(srcbuf[:], src[:siz]) cryptBlocksGCM(aes.BlockFunction(&g.cipher), aes.BlockKey(&g.cipher), dst[:siz], srcbuf[:siz], ctrbuf[:], cnt) src = src[siz:] dst = dst[siz:] } if len(src) > 0 { var x [16]byte aes.EncryptBlockInternal(&g.cipher,...